New Features

Add name keyword argument to loop.create_task()
(by @fantix in d51ce36 for #309)
Add typing support
(by @bryanforbes in 9426e2b, for #358)

Bug Fixes

SSL: many improvements
(by @fantix in 6476aad, 8beacd2, 98e113e, ae44ec2, @asvetlov in 9bc4a20)
Fix KeyboardInterrupt handling logic
(by @1st1 in c32c703 for #295, @jack1142 in 8c471f8 for #337)
Python 3.8/3.9 compatibility fixes, drop support for 3.5/3.6
(by @jack1142 in 2870219 for #314, @achimnol in 0d14ec6 for #328, @aeros in 6ef69a7 for #349, @shadchin in 1fd9066, @fantix in 465717f, 200e140, afc3ee8, cdd2218, b7048b9)
UDP: multiple bug fixes
(by @fantix in 1d9267a for #319, 9e017e6 for #304, 506a2aa)
Pipe: a critical crash fix that affects subprocess, pipe and socketpair
(by @fantix in 5d41af8 and @tardyp in c392972 for #311 #312 #317)
Restore context on protocol callbacks
(by @versusvoid in 7b202cc for #305, @fantix in f691212)
Subprocess: stdio bug fixes
(by @fantix in 8cdb300 for #136, @lovasoa in 68db1a2 for #363)
Sock: fix issue in sock_connect() for large concurrency
(by @fantix in fe3d028 for #378)
Misc fixes about docs URL, test typo, and CI compatibility
(by @asfaltboy in 3810530, @felixonmars in fcb3735, @fantix in 6596685)

Check Cython version semantically
(by @YoSTEALTH in 5dc299b)
Add .flake8 to distribution tarball
(by @jlaine in e8eb502 for #330)
Switch to Github actions
(by @elprans in 3be8967, e21ceea, @fantix in 311997e)
Bump libuv to v1.40.0
(by @fantix in 998c19e)